# All files / src/providers/gemini Transcription.ts

83.33% Statements 20/24
50% Branches 6/12
100% Functions 3/3
82.6% Lines 19/23

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     import { TranscriptionRequest, TranscriptionResponse } from "../Provider.js";
    import { handleGeminiError } from "./Errors.js";
    import { BinaryUtils } from "../../utils/Binary.js";
    import { GeminiGenerateContentRequest, GeminiGenerateContentResponse } from "./types.js";
    import { logger } from "../../utils/logger.js";

    export class GeminiTranscription {
      private static readonly DEFAULT_PROMPT =
        "Transcribe the provided audio and respond with only the transcript text.";

      constructor(
        private readonly baseUrl: string,
        private readonly apiKey: string
      ) {}

      async execute(request: TranscriptionRequest): Promise<TranscriptionResponse> {
        const model = request.model || "gemini-2.0-flash";
        const url = `${this.baseUrl}/models/${model}:generateContent?key=${this.apiKey}`;

        const result = await BinaryUtils.toBase64(request.file);
        Iif (!result) {
          throw new Error(`Failed to load audio file: ${request.file}`);
        }
        const { data: base64Data, mimeType } = result;

        let prompt = GeminiTranscription.DEFAULT_PROMPT;
        Iif (request.language) {
          prompt += ` Respond in the ${request.language} language.`;
        }
        Iif (request.prompt) {
          prompt += ` ${request.prompt}`;
        }

        const payload: GeminiGenerateContentRequest = {
          contents: [
            {
              role: "user",
              parts: [
                { text: prompt },
                {
                  inlineData: {
                    mimeType,
                    data: base64Data
                  }
                }
              ]
            }
          ],
          generationConfig: {
            responseMimeType: "text/plain"
          }
        };

        logger.logRequest("Gemini", "POST", url, payload);

        const response = await fetch(url, {
          method: "POST",
          headers: {
            "Content-Type": "application/json"
          },
          body: JSON.stringify(payload)
        });

        Iif (!response.ok) {
          await handleGeminiError(response, model);
        }

        const json = (await response.json()) as GeminiGenerateContentResponse;
        logger.logResponse("Gemini", response.status, response.statusText, json);
        const text = json.candidates?.[0]?.content?.parts?.map((p) => p.text).join("") || "";

        return {
          text,
          model,
          segments: [] // Gemini's generateContent doesn't return segments by default
        };
      }
    }